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Your heart beats over 36 million times a year.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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Once thought to have neurofibromatosis, Joseph Merrick (also known as "the elephant man") is now, in retrospect, thought by clinical experts to have had Proteus syndrome. This endocrine disease causes continued and abnormal growth of the bones, muscles, skin, and so on and can become completely debilitating with severe deformities occurring anywhere on the body.
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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.